Oral Cavity

Oral Cavity PowerPoint PPT Presentation


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Oral Cavity

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1. 21 Jan. 2010 OralCavity.ppt 1 Oral Cavity Mouth, Teeth, Salivary glands, & Pharynx

2. 21 Jan. 2010 OralCavity.ppt 2 Oral Cavity, the Mouth Lips (labia) orbicularis oris muscle Palate Hard Soft Tongue Gingivae & teeth

3. 21 Jan. 2010 OralCavity.ppt 3 Tooth Gingivae Mucous membrane covering maxillae & mandible. Tooth Crown Root Periodontal ligament Enamel Dentin Pulp cavity & pulp Root canal Apical foramen

4. 21 Jan. 2010 OralCavity.ppt 4 Teeth Dentition Deciduous (= milk, baby teeth) 6 months - ~ 12 yr. 20 teeth Each jaw has 4 incisors 2 canines 4 premolars Dental formula 2. 1. 2 2. 1. 2

5. 21 Jan. 2010 OralCavity.ppt 5 Teeth Dentition Adult (permanent) 6 yr. - ~ 21 yr. on 32 teeth Each jaw has 4 incisors 2 canines 4 premolars 6 molars Dental formula 2. 1. 2. 3 2. 1. 2. 3

6. 21 Jan. 2010 OralCavity.ppt 6 Teeth Replacement: Teeth of a 9 year old male.

7. 21 Jan. 2010 OralCavity.ppt 7 Salivary Glands Produce saliva Water, mucus, amylase, lysozyme Lubricates food Salivary amylase begins digestion of starch, Lysozyme kills some bacteria

8. 21 Jan. 2010 OralCavity.ppt 8 Salivary Glands Parotid glands Submandibular glands Sublingual glands

9. 21 Jan. 2010 OralCavity.ppt 9 Swallowing Swallowing reflex Buccal phase (voluntary) Tongue forces bolus to back of mouth Pressure receptors in soft palate relay sensory impulses to swallowing center in medulla oblongata.

10. 21 Jan. 2010 OralCavity.ppt 10 Swallowing Swallowing reflex Pharyngeal-esophageal phase Motor impulses from swallowing center to raise soft palate, pull larynx up & forward, pull epiglottis down over glottis

11. 21 Jan. 2010 OralCavity.ppt 11 Swallowing Swallowing reflex Pharyngeal-esophageal phase Bolus passes into esophagus, Peristalsis pushes food to stomach Cardiac sphincter opens to let bolus into stomach.

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